Rb2O7S2 seems not to be a widely recognized chemical substance. We usually do not find it in the periodic table of chemical elements, nor do we see it in the general chemistry textbooks.
Perhaps you have made a mistake or misunderstood this chemical substance. If you are trying to understand the chemical structure of a specific different substance, please provide additional information so we can assist you better.
If you want to understand more about chemical structure, we can consider another specific example. For example, H2O (water) consists of two hydrogen atoms and one oxygen atom. Or NaCl (table salt) consists of one sodium atom (Na) and one chlorine atom (Cl).
However, if you are studying a more complex chemical substance, we recommend that you seek the assistance of a chemical expert or a professional chemistry teacher.